Hi Andre'a-
Sorry, that's not possible. That's what the conclusion of this thread is about: you can't disable that without updating to a more recent windows, I'm afraid. It's a real pain.
You have 2 choices:
- Live with it - the "Get Even More out of Windows" will pop up once per month
- Update windows as Rick described. I have done this in recent weeks on 18 computers; all the updates worked flawlessly and required no interference from me. I would say it's a very safe procedure
There is no option 3, I'm afraid. Good luck!